What is the value of each expression if c=4 c/2

One of the same side angles of two parallel lines is 20° smaller than the other one. find the measures of these two angles.

Saline iv fluid bags cost $64.20 for 24, 1000 ml bags from one supplier. a new supplier sells 500 ml bags for $2 each. the hospital uses about 10,000, 1000 ml bags each month. nurses report that about half of the bags are more than half full when they are discarded. if you are going to use only one supplier, which size bag provides the best deal, and how much will you save each month? compare the cost of the new supplier to the current one.

Aquadrilateral has exactly one pair of parallel sides. which name best describes the figure?